How To Use Sd Slot On Imac
On all Macbook Air (and Macbook Pro) notebooks running Windows (regardless of version) via a Bootcamp partition, the SD card slot invariably disappears whenever the Macbook goes through a sleep/wakeup cycle. The SD card slot becomes a hidden device (in Device Manager). Mar 26, 2019 Number of memory slots: 4: Base memory: 4GB (but is configured to order) Maximum memory: 16GB For iMac (Late 2009), you can use 2GB or 4GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot. For iMac (Mid 2010) and iMac (Mid 2011), use 2GB or 4GB RAM SO-DIMMs of 1333MHz DDR3 SDRAM in each slot.
Best answer: You can! The information is a bit buried in the spec sheet, but Apple's official website confirms it.
- Fastest processor yet: 27-inch iMac (From $1799)
- RAM upgrade: Crucial 32GB DDR4 Memory kit ($207)

The 27-inch iMac still has a backdoor for RAM
One of the biggest deciding factors for some people have in figuring out whether to buy the 21-inch iMac or the 27-inch iMac is aftermarket upgradable RAM. The 21.5-inch does not allow for post-purchase upgrades without invalidating your warranty.
The 27-inch iMac is the only iMac that allows for aftermarket upgrades to RAM. That means, you can buy additional RAM (up to 32GB) any time you want, long after you've bought your new iMac.
The 27-inch iMac does have user-accessible RAM upgrade slots. From Apple's website:
Memory: 8GB (two 4GB) of 2666MHz DDR4 memory; four SO-DIMM slots, user accessible [emphasis added].
You're good to start with the lowest RAM and upgrade later when you've recovered from that hefty purchase.
I've done this with two 27-inch iMac computers. Each time, I postpone a RAM upgrade until I need it, which gives me time to save up a little extra cash and keeps me from spending money unnecessarily.
The 21.5-inch iMac is still off-limits
Back in 2012, Apple shut off aftermarket RAM upgrades for the 21.5-inch iMac. RAM was relocated under the logic board, so it was no longer accessible without having to take apart the entire iMac.
These days, if you want to attempt a DIY RAM upgrade on the 21.5-inch iMac, you'd need a lot of experience and a special upgrade kit, something like the ones iFixit sells. Of course, doing so will void your warranty, so it may not necessarily be worth the risk.
If you decide to go with the 21.5-inch iMac, I highly suggest configuring it with the most RAM you can afford at the time you purchase it.
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27-inch iMac (2019)
Apple's 2019 iMac is the fastest it's ever been.
If you're ready to upgrade your iMac, now is the time. With a brand new, faster Coffee Lake processor and AMD graphics, your new iMac is running at top speed.
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Crucial RAM for Mac(From $54 at B&H)
With the 27-inch iMac comes great RAM responsibility. Choose wisely.
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